Ratings; Power Connections; Ground Connections - Control Techniques Unidrive SP Guide Abrégé

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Information Information Installation
4.1

Ratings

See section 10.1 on page 283.
Maximum continuous input current
The values of maximum continuous input current are given to aid the selection of cables
and fuses. These values are stated for the worst case condition with the unusual
combination of stiff supply with high imbalance. The value stated for the maximum
continuous input current would only be seen in one of the input phases. The current in
the other two phases would be significantly lower.
The values of maximum input current are stated for a supply with a 2% negative phase-
sequence imbalance and rated at the maximum supply fault current given in section
10.1 on page 283.
The recommended cable sizes in section 10.1 on page 283 are only a guide. Refer to
local wiring regulations for the correct size of cables. In some cases a larger cable is
required to avoid excessive voltage drop.
The recommended output cable sizes in section 10.1 on page 283 assume that the
NOTE
motor maximum current matches that of the drive. Where a motor of reduced rating is
used the cable rating may be chosen to match that of the motor. To ensure that the motor
and cable are protected against over-load, the drive must be programmed with the
correct motor rated current.
UL listing is dependent on the use of the correct type of UL-listed fuse, and applies when
NOTE
symmetrical short-circuit current does not exceed 5kA for sizes 1 to 3.
Fuses
The AC supply to the drive must be fitted with suitable protection against overload and
short-circuits. Section 10.1 on page 283 shows recommended fuse ratings. Failure to
observe this requirement will cause risk of fire.
WARNING
A fuse or other protection must be included in all live connections to the AC supply.
An MCB (miniature circuit breaker) or MCCB (moulded-case circuit-breaker) with type C
may be used in place of fuses for size 1 to 3 under the following conditions:
• The fault-clearing capacity must be sufficient for the installation
• For frame sizes 2 and 3, the drive must be mounted in an enclosure which meets
the requirements for a fire enclosure
See Chapter 11 UL Listing Information on page 349 for UL listing requirements.
Fuse Types
The fuse voltage rating must be suitable for the drive supply voltage.
4.2

Power connections

Refer to section 10.9 on page 296 for details of the Unidrive SP power connections.

Ground connections

The drive must be connected to the system ground of the AC supply. The ground wiring
must conform to local regulations and codes of practice.
On size 0, the supply and motor ground connections are made using the M6 threaded
hole in the metal back plate of the drive located at the top and bottom of the drive.
On size 1, the supply and motor ground connections are made using the M5 studs
located either side of the drive near the plug-in power connector.
On size 2, the supply and motor ground connections are made using the grounding
bridge that locates at the bottom of the drive.
On size 3, the supply and motor ground connections are made using a M6 nut and bolt
14
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